diff --git a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
index 5ef5bd60..f8b0260b 100644
--- a/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
+++ b/modules/EcommerceFinance/Repositories/ThirdPartyWarehouseStorageMirrorRepository.php
@@ -638,9 +638,9 @@ class ThirdPartyWarehouseStorageMirrorRepository
     }
 
     /**
-     * The month immediately after an authoritative report starts from that report's closing
-     * quantity. Current inventory is deliberately ignored because it cannot reproduce the
-     * historical opening balance of each subwarehouse.
+     * Every later month starts from the latest authoritative month closing quantity and
+     * rolls confirmed movements forward to the requested month. Current inventory is
+     * deliberately ignored because it cannot reproduce historical opening balances.
      *
      * @param array{start:string,end:string} $period
      * @param array<string,mixed> $filters
@@ -765,13 +765,15 @@ class ThirdPartyWarehouseStorageMirrorRepository
                 ];
             }
 
+            $authorityEnd = Carbon::parse($authority['source_month'])
+                ->addMonth()->startOfMonth()->format('Y-m-d 00:00:00');
             $movements = $this->confirmedMovements($headerGeneration, $itemGeneration, null)
-                ->where('h.occurred_at', '>=', $period['start'])
+                ->where('h.occurred_at', '>=', $authorityEnd)
                 ->where('h.occurred_at', '<', $period['end'])
                 ->whereIn('h.wms_co_id', $pairRows->pluck('wms_co_id')->filter()->unique()->values()->all())
                 ->whereIn('i.sku_code', $pairRows->pluck('sku_code')->unique()->values()->all())
                 ->select([
-                    'h.wms_co_id', 'h.io_type', 'i.sku_code',
+                    'h.wms_co_id', 'h.io_type', 'h.occurred_at', 'i.sku_code',
                     'i.qty as movement_qty', 'i.qty_type as movement_qty_type',
                 ])->selectRaw('COALESCE(NULLIF(h.wh_id, 0), 1) AS wh_id');
             $signed = '(COALESCE(mv.movement_qty, 0) * COALESCE(mv.movement_qty_type, 0))';
@@ -780,16 +782,22 @@ class ThirdPartyWarehouseStorageMirrorRepository
                     $join->on('mv.wms_co_id', '=', 'a.wms_co_id')
                         ->on('mv.wh_id', '=', 'a.wh_id')
                         ->on('mv.sku_code', '=', 'a.sku_code');
-                })->groupBy([
+            })->groupBy([
                     'a.owner', 'a.warehouse_provider', 'a.source_warehouse', 'a.wms_co_id',
                     'a.wh_id', 'a.sku_code', 'a.category', 'a.opening_qty',
-                ])->select([
-                    'a.owner', 'a.warehouse_provider', 'a.source_warehouse', 'a.wms_co_id',
-                    'a.wh_id', 'a.sku_code', 'a.category', 'a.opening_qty',
-                ]);
+            ])->select([
+                'a.owner', 'a.warehouse_provider', 'a.source_warehouse', 'a.wms_co_id',
+                'a.wh_id', 'a.sku_code', 'a.category', 'a.opening_qty',
+            ]);
+            $monthly->selectRaw(
+                'a.opening_qty + COALESCE(SUM(CASE WHEN mv.occurred_at >= ? AND mv.occurred_at < ? '
+                . 'THEN ' . $signed . ' ELSE 0 END), 0) AS rolled_opening_qty',
+                [$authorityEnd, $period['start']],
+            );
             foreach (self::MOVEMENT_COLUMNS as $column => $type) {
-                $expression = 'COALESCE(SUM(CASE WHEN mv.io_type = ? THEN ' . $signed . ' ELSE 0 END), 0)';
-                $monthly->selectRaw($expression . ' AS ' . $column, [$type]);
+                $expression = 'COALESCE(SUM(CASE WHEN mv.occurred_at >= ? AND mv.occurred_at < ? '
+                    . 'AND mv.io_type = ? THEN ' . $signed . ' ELSE 0 END), 0)';
+                $monthly->selectRaw($expression . ' AS ' . $column, [$period['start'], $period['end'], $type]);
             }
 
             $rows = $monthly->orderBy('a.warehouse_provider')->orderBy('a.wh_id')->orderBy('a.sku_code')
@@ -801,7 +809,7 @@ class ThirdPartyWarehouseStorageMirrorRepository
                             trim((string) $row->warehouse_provider),
                             (int) $row->wh_id,
                         );
-                    $closingQuantity = (float) $row->opening_qty;
+                    $closingQuantity = (float) $row->rolled_opening_qty;
                     foreach (array_keys(self::MOVEMENT_COLUMNS) as $column) {
                         $closingQuantity += (float) $row->{$column};
                     }
@@ -813,7 +821,7 @@ class ThirdPartyWarehouseStorageMirrorRepository
                         'warehouse' => $warehouse,
                         'product_code' => $row->sku_code,
                         'category' => $row->category,
-                        'opening_quantity' => $row->opening_qty,
+                        'opening_quantity' => $row->rolled_opening_qty,
                         'closing_quantity' => $closingQuantity,
                         'processing_in' => $row->processing_in,
                         'processing_out' => $row->processing_out,
@@ -847,11 +855,11 @@ class ThirdPartyWarehouseStorageMirrorRepository
     /** @param array{start:string,end:string} $period */
     private function previousMonthlyInventoryAuthority(array $period): ?array
     {
-        $previousMonth = Carbon::parse($period['start'])->subMonth()->startOfMonth()->toDateString();
         $state = $this->connection->table(self::INVENTORY_REPORT_AUTHORITATIVE_STATE_TABLE)
             ->where('dataset_key', self::INVENTORY_REPORT_AUTHORITATIVE_DATASET_KEY)
             ->whereNotNull('active_generation')
-            ->whereDate('source_month', $previousMonth)
+            ->whereDate('source_month', '<', Carbon::parse($period['start'])->startOfMonth())
+            ->orderByDesc('source_month')
             ->first();
         if ($state === null || trim((string) $state->active_generation) === '') {
             return null;
@@ -859,7 +867,7 @@ class ThirdPartyWarehouseStorageMirrorRepository
 
         return [
             'generation' => (string) $state->active_generation,
-            'source_month' => $previousMonth,
+            'source_month' => Carbon::parse($state->source_month)->startOfMonth()->toDateString(),
         ];
     }
 
diff --git a/tests/Unit/EcommerceFinance/ThirdPartyWarehouseStorageMirrorRepositoryTest.php b/tests/Unit/EcommerceFinance/ThirdPartyWarehouseStorageMirrorRepositoryTest.php
index b71ffe18..b5a30710 100644
--- a/tests/Unit/EcommerceFinance/ThirdPartyWarehouseStorageMirrorRepositoryTest.php
+++ b/tests/Unit/EcommerceFinance/ThirdPartyWarehouseStorageMirrorRepositoryTest.php
@@ -239,6 +239,37 @@ class ThirdPartyWarehouseStorageMirrorRepositoryTest extends TestCase
         $this->assertSame(5.0, (float) $rows['简尚-崔桥工厂仓主仓']->transfer_in);
     }
 
+    public function test_inventory_report_rolls_multiple_months_from_the_july_authoritative_baseline(): void
+    {
+        $this->markReady();
+        $this->insertProduct('SKU-ROLL-MULTI');
+        $this->insertInventory('SKU-ROLL-MULTI', 999, '2026-09-11 03:21:00');
+        $this->insertInventoryReportAuthoritativeRow([
+            'source_month' => '2026-07-01',
+            'report_month' => '2026-07-01',
+            'warehouse_provider' => '三方-南昌樵舍仓',
+            'warehouse' => '三方-南昌樵舍仓主仓',
+            'product_code' => 'SKU-ROLL-MULTI',
+            'opening_quantity' => 10,
+            'closing_quantity' => 12,
+        ]);
+        $this->insertMovement('SKU-ROLL-MULTI', '采购进仓', 3, 1, '2026-08-02 10:00:00');
+        $this->insertMovement('SKU-ROLL-MULTI', '销售出仓', 2, -1, '2026-09-03 10:00:00');
+
+        $result = $this->repository->paginateMonthlyInventoryReport([
+            'month' => '2026-09',
+            'product_code' => 'SKU-ROLL-MULTI',
+            'warehouse_provider' => '',
+            'category' => '',
+        ], 1, 25);
+        $row = $result['data'][0];
+
+        $this->assertSame(1, $result['total']);
+        $this->assertSame(15.0, (float) $row->opening_quantity);
+        $this->assertSame(13.0, (float) $row->closing_quantity);
+        $this->assertSame(-2.0, (float) $row->sales_out);
+    }
+
     public function test_inventory_report_product_code_filter_is_exact(): void
     {
         $this->markReady();
@@ -971,16 +1002,18 @@ class ThirdPartyWarehouseStorageMirrorRepositoryTest extends TestCase
     private function insertInventoryReportAuthoritativeRow(array $overrides = []): void
     {
         $generation = '55555555-5555-5555-5555-555555555555';
+        $sourceMonth = (string) ($overrides['source_month'] ?? '2026-08-01');
+        unset($overrides['source_month']);
         DB::connection('business_mirror')->table('inventory_report_authoritative_states')->insert([
             'dataset_key' => 'jiansun.inventory-report.authoritative-month',
             'status' => 'succeeded',
             'active_generation' => $generation,
-            'source_month' => '2026-08-01',
+            'source_month' => $sourceMonth,
         ]);
         DB::connection('business_mirror')->table('inventory_report_authoritative_rows')->insert(array_merge([
             'generation' => $generation,
             'row_key' => hash('sha256', 'authoritative-row'),
-            'report_month' => '2026-08-01',
+            'report_month' => $sourceMonth,
             'owner' => '常州简尚家居有限公司',
             'warehouse_provider' => '仓储方',
             'warehouse' => '子仓',